Improvement in air-heating furnaces



. e. R. Moon.

.AIR-HEATING FURNACE.

Patented Feb; 8,1316.

fldnesses I UNI D STATES in regard to the coal fires used in them.

PArENr came GEORGE R. MOORE, on PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT m AIR-HEATING FURNACES.

Specification forming part of Letters Patent No. 173,230, dated February 8, 1876; application filed 1 December22, 1875.

To all whom it may concern:

Be it known that I, GEO. R. MOORE, of theful Improvements in Air-Heating Furnaces,

which improvenients are fully set-forth in the following specification, reference being bad to the accompanying drawings.

The object of my invention is to increase the efficiency of air heating furnaces, and to add facilities for theirfeasier management The drawings show an. ordinary portable airheating furnace with my improvements applied.

Figure 1 is a vertical transverse section taken at right angles with the front of the heater. Fig. 2 is in part a front view, and in part a vertical transverse section, taken at right angles with Fig.1. Fig. 3 is a horizontal transverse section taken in the line 3 4 of I Fig. 1. Fig. 4 is a horizontal transverse section' taken in the line 1 2 of Fig. 2.

A is the ash-pit a, fire-brick lining to the fire-chamber. B is the fire-chamber; b, the fire-brick arch over the fire-chamber, provided with small central apertures c, for carrying air into the fire'chamber to aid in the consumption of gas, also with apertures 11 all around its external circumference for draft into the smoke-flues-in this case one annular flue. c c are smoke-fines, and connect with the fire-chamber through: the annular flue Y or space between the cylinders D and E, which are combined and closed at the top, and so fitted upon the arch b of the fire-chamber that they form a complete "and sufficient flue with the pipes c to the. chimney, as shown by the arrows. c c are air-passages from the base of the heater up into the main air-chambe r. F isa cold-air pipe for the introduction of outi door air directly upon the hottest place of the arch over the fire chamber. G is the grate. H is a lever running diagonally across the ash-pit, and provided with a socket at the center, which receives the grate by a pin, g, ex-

tending down f'romit. I and J are also levers, pivoted at a" and j. J is loosely jointed at one end with H and at'the other with 1, so

that when the handlesof I and H are moved alike up or down the other end of is moved in the same direction also, so that with'this arrangement of levers the grate may be caroutside casing of the main air-chamber. Mf

M, flanges for pipes to conduct away the hot air. N is a coal-reservoir, connecting with the fire-chamber through themain passage i from the ordinary feed-door, so that the fire may be fed in this way, partially in the manner of an ordinary magazine, when desired;

n,- door to the chamber .N. O is the direct passage to the fire-chamber, and 0 is the door to the same. P is the ash-pit door Q, small doors for opening to the top of the grate. R is a cover to the smoke-flue across the bottom plate of the ash-pit. f is a rod for operating the grate horizontally. his a damper, to be closed when it is desired to turn the draft down through the opposite flue O and around, as shown by the arrows. S S are ratchets for holding the leversH and I whenever desired. If the fire is to be cleaned partially it can be done by use of the rod f, vibrating the grate horizontally; if thoroughly, the levers H and I should be used to drop the grate down to a convenient distance below the fire-chamber for operating over it with a poker. Again, if a moderate fire is' sufi'icient and it is desired to perpetuate it; the door 0 should be closed,

-and through the supplemental door a fill up the reservoir, and the desired result will be obtained. The heavy fire-brick b, arching over the fire-chamber, is designed to store heat, so as to give a more uniform, equable, and longer continued resultthan is usual from variable and inconstant firing. As this arch is exposed to the greatest heat, it will radiate rapidly, and I direct a cold-air pipe from the outdoor air directly downupon itsycenter; As heat radiation does not repel cold air, I obtain a rapid current, and thus keep down the heat of the arch and prevent the deoxidizing of the air. There is no diving draft in this furnace directly from the fire-chamber but from the upper part of the annular'smokeflue above the fire-chamber, and between D and E, there is a (living draft down 0, obtained by turning the damper it upon the opposite side of the furnace, all of which drafts are well shown by arrows.

I claim- 1. The ash-pit A, provided internally with two vertical smoke-tines, in communication with the fire-chamber above by suitable pipes, and connected with each other at the bottom by the horizontal flue T, substantially as and for the purpose herein set forth.

2. In combination, the two inclinedpassages N and 0, running from their respective feed-doors in the casing of the heater to the fire-chamber B, and discharging together into the side of the same, substantially as sho wn. 

